采用氨基功能化氧化石墨烯改性正渗透膜的抗污染机理及时效性研究

项目名称： 采用氨基功能化氧化石墨烯改性正渗透膜的抗污染机理及时效性研究

项目编号： No.51478099

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 李方

作者单位： 东华大学

项目金额： 80万元

中文摘要： 基于能耗和环境友好性的优势，正渗透（FO）工艺是目前膜科学技术的研究热点。本项目根据氧化石墨烯（GO）的亲水性和易修饰的特点，首次提出采用氨基功能化氧化石墨烯对复合FO膜进行表面改性，以减缓膜污染和浓差极化等限制性因素。本项目拟采用共混、化学接枝和涂覆-接枝的方式分别进行膜表面改性，从膜面微观形貌、分子水平的微观作用力等角度研究氨基功能化的氧化石墨烯（AFGO）改性的FO膜的抗污染性能和机理，采用表面自由能分析与多种分析测试手段，从表征和机理两方面论证AFGO改性FO膜的可行性和优越性。除错流式模拟污染实验之外，本项目还提出采用结合MBR长期运行的方式，对改性FO膜在活性污泥系统中对胞外聚合物的吸附特征，同时验证AFGO改性膜表面的时效性。本项目研究成果为FO膜材料改进和表面改性技术提供理论基础，污染机理研究成果也为膜污染控制技术所借鉴，有利于FO膜技术应用推广。

中文关键词： 氧化石墨烯；表面改性；正渗透；膜污染；时效性

英文摘要： Forward osmosis (FO) is of intriguing interest in membrane science and technology because of its advantages in energy consumption and environmental friendliness. Due to the hydrophilicity and modificability of the grapheme oxide (GO), surface modification of composite FO membrane with amine-functionalized GO (AFGO) is proposed in this project. This modification is able to reduce membrane fouling and concentration polarization that limited the membrane application. The modification methods to be adopted include blending, chemical grafting, coating-grafting. The anti-fouling performance and mechanism of the FO membrane modified with AFGO will be investigated by the analysis of the memrbane surface morphology and interaction of moleculars. With the theory of the surface free energy and multiple measurements, this project is to confirm the feasibility and superiority of the FO membrane modification with AFGO theoretically and practically. Besides the membrane samples are tested in cross-flow filtration for a simulative fouling experiment,the performance of modified FO membranes will be used in membrane bioreactor (MBR) for a long-term to investigate the durability of the modification. It also aims at investigating the adsorption of extracellular polymeric substances in active sludge on the modified membranes These research results will provide the theoretical support for the research of membrane material and surface modification. It also will be helpful to the development of membrane anti-fouling technology and the application of FO process.

英文关键词： graphene oxide;surface modified;forward osmosis;membrane fouling;durability